<template>
  <div class="todo-footer" v-show="total">
    <label>
      <input type="checkbox" v-model="isAll" />
      <!-- <input type="checkbox" :checked="isAll" @change="checkAll"/> -->
    </label>
    <span>
      <span>已完成{{ donelist }}</span> / 全部{{ total }}
    </span>
    <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "myfooter",
  props: ["todolist", "checkAllTodo", "clearAllTodo"],
  computed: {
    // donelist(){
    //   var i=0;
    //   this.todolist.forEach(todo => {
    //     if(todo.done===true){
    //       i++;
    //     }
    //   });
    //   return i
    // }
    // 已完成的
    donelist() {
      return this.todolist.reduce((pre, current) => {
        return pre + (current.done ? 1 : 0);
      }, 0);
      // return this.todolist.reduce((pre,todo)=>pre+(todo.done?1:0),0)
    },
    // 总条数
    total() {
      return this.todolist.length;
    },
    //是否全选
    // isAll(){
    //   return this.donelist === this.total && this.total>0
    // }
    isAll: {
      set(value) {
        this.checkAllTodo(value);
      },
      get() {
        return this.donelist === this.total && this.total > 0;
      },
    },
  },
  methods: {
    // checkAll(e){
    //   this.checkAllTodo(e.target.checked)
    // }
    clearAll() {
      if (confirm("确定删除吗？")) {
        this.clearAllTodo();
      }
    },
  },
};
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>